speedo and tach help August 30, 2007, 07:14:20 PM I'm working on a '92 mercury cougar LS with a 3.8 First, the tach is pinned. Second, the speedometer does not operate now. The speedometer always was erratic but the tach always worked fine until now.Any help is appreciated! Fuse 9 HEGO what the heck is that? I never heard of it and I'm curious.THANKSJR Quote Selected
speedo and tach help Reply #1 – August 30, 2007, 11:07:03 PM Its fixed for now. had to take it part but....HEGO = heated oxygen sensor. So now I know what that fuse is for. Quote Selected
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